Add toggle to stickiness due to TF/AWS API issues

main.tf

@@ -162,9 +162,17 @@ resource "aws_lb_target_group" "tg" {
     "instance",
   )
 
-  stickiness {
-    type    = "lb_cookie"
-    enabled = false
+  dynamic "stickiness" {
+    for_each = lookup(
+      var.tg_map[element(local.tg_keys, count.index)],
+      "stickiness_placeholder",
+      false,
+    ) ? toset(["build"]) : toset([])
+
+    content {
+      enabled = false
+      type    = "lb_cookie"
+    }
   }
 
   health_check {

tests/test1/main.tf

@@ -139,9 +139,10 @@ module "external" {
 
   tg_map = {
     listener1 = {
-      dereg_delay = 300
-      port        = 80
-      target_type = "instance"
+      dereg_delay            = 300
+      port                   = 80
+      target_type            = "instance"
+      stickiness_placeholder = true
     }
   }
 
@@ -200,9 +201,10 @@ module "internal" {
 
   tg_map = {
     listener1 = {
-      dereg_delay = 300
-      port        = 80
-      target_type = "instance"
+      dereg_delay            = 300
+      port                   = 80
+      target_type            = "instance"
+      stickiness_placeholder = true
     }
   }
 
@@ -233,4 +235,3 @@ module "asg" {
     module.internal.target_group_arns,
   )
 }
-

variables.tf

@@ -145,6 +145,8 @@ tg_map  = {
     "target_type"   = "instance"
   }
 }
+
+N.B. if you receive an error `Network Load Balancers do not support Stickiness` then try adding a key to your problem target groups of `stickiness_placeholder = true`
 */
 variable "tg_map" {
   description = "target group map"